Converting between explicit, implicit and parametric function 1. Given an explicit function y

minwaardekn

minwaardekn

Answered question

2022-06-19

Converting between explicit, implicit and parametric function
1. Given an explicit function y = sin ( x ) + cos ( x ), how to convert it to the respective parametric functions x = f 1 ( t ), y = f 2 ( t )?
2. Given parametric functions x = sin ( t ) and y = cos ( t ), how to obtain the respective implicit function f ( x , y ) = 0?
3. Given parametric functions x = 1 + 2 t and y = 3 + 4 t, how to obtain the respective implicit function f ( x , y ) = 0 ?

Answer & Explanation

Jaida Sanders

Jaida Sanders

Beginner2022-06-20Added 18 answers

Step 1
1. You can choose for example x as parameter, which leads to:
{ x = t y = sin ( t ) + cos ( t )
Step 2
2. It is well known that sin 2 ( t ) + cos 2 ( t ) = 1 for all t R . So this curve (I pretend to ignore which curve it is ...) is included in the one with implicit equation:
x 2 + y 2 = 1
and it should be verified that te reverse inclusion is true (provided that t can take any real value, or at least any value in some [ a , a + 2 π ).
Step 2
3. You have to "eliminate" t between those two equations. The first one gives you: t = x 1 2 . Putting that in the second one leads to:
y = 3 + 2 ( x 1 )

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